os.popen() objects don't support the context manager protocol

[pitrou]

BPO	7461
Nosy	@amauryfa, @pitrou
Files	with_popen.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2009-12-09.00:04:04.626>
created_at = <Date 2009-12-08.19:52:31.387>
labels = ['type-bug', 'library']
title = "os.popen() objects don't support the context manager protocol"
updated_at = <Date 2009-12-09.00:04:04.625>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2009-12-09.00:04:04.625>
actor = 'pitrou'
assignee = 'none'
closed = True
closed_date = <Date 2009-12-09.00:04:04.626>
closer = 'pitrou'
components = ['Library (Lib)']
creation = <Date 2009-12-08.19:52:31.387>
creator = 'pitrou'
dependencies = []
files = ['15504']
hgrepos = []
issue_num = 7461
keywords = ['patch']
message_count = 5.0
messages = ['96151', '96156', '96158', '96160', '96161']
nosy_count = 2.0
nosy_names = ['amaury.forgeotdarc', 'pitrou']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'needs patch'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue7461'
versions = ['Python 3.1', 'Python 3.2']

[pitrou]

This works under trunk but fails under py3k:

>>> import os
>>> with os.popen("ls", "r") as f:
...  print(f.read())
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: __exit__

[amauryfa]

Here is a patch+test

[pitrou]

We should also proxy other special methods. There is __iter__, __next__,
what else?

[pitrou]

Ah, iterating already works. Sorry for the noise.

[pitrou]

I added a test for iterating and committed the patch in r76723 and
r76724. Thanks!